Lathe



F.T.POTTER May 25, 1937.

LATHE Filed March 5, 1956 3 Sheets-Sheet 1 May 25, 1937.

F. T. POTTER LATHE Filed March 5, 1936 5 Sheets-Sheet 3 Patented May 25, 1937 c UNITED STATES PATENT o FicE LATHE Frederick T. Potter, Whitinsville, Mass., assignor to Stark Tool Company, Waltham, Mass., a

} corporation of Massachusetts R S S U B 3 Application March 5, 1936, Serial No. 57,241

4 Claims. (01. 74-23017) Objects of the present invention are to prothe casing 2; and by moving the bolts 25 upvide a lathe which is compact and light in weight, wardly or downwardly in the slots 21 the shaft which is inexpensive to manufacture and durable i may be adjusted vertically. After the shaft 1 in use, which has a wide speed range and which is adjusted to desired position, either horizonis convenient to use. Other objects will be tally or vertically or both, it is secured in adjusted 5 evident from the illustration of a typical embodiposition by tightening the bolts 25.

ment shown in the accompanying drawings, in Mounted in alignment on the countershaft 1 which, and the driven shaft 9 are two V-pulleys having Fig. 1 is a'front elevation of the lathe; opposite stationary cones 30 and 3| fast to their 0 Fig. 2 is a section on line 2-2 ofFig. 1; respective shafts by set-screws 32 and 33 and Fig. 3 is a section-on line 3-3 of Fig. 1; having opposite'adjustable cones 34 and 35 mov- Fig. 4 is a section on line 4-4 of Fig. 2; 'ablealong their respective shafts and keyed to Fig. 5 is a section on line 5-5 of Fig. 4; the shafts as shown'at 5| (Fig. 7). The movable 6 is a section on line 56 of Fig. 3; and cones 34 and 35 have hubs-36 and 31 carrying 5 Fig. -7 is a section on line 1-4 of Fig. 6. ball-bearings 38 and 39, the outer rings of which The particular embodiment of the invention are interengaged with the ends of arms 40 and chosen for the purpose of illustration comprises 4| respectively (Fig. 6 As shown in Fig. 4 the a head-stock casing formed in upper and lower other ends of the arms 40 and 4| are fast to a parts and 2, the upper part having a removrod 42 mounted for endwise movement in the U able section 3, a head-stock spindle-4 journaled casin Intermediate the two arms and g n the upper portion of the casing and carrying the rod 42 carries a depending lug 43 threaded to a pulley 5 adapted to accommodate three belts receive the threaded shaft 44. The shaft 44 is 6, a countershaft "I located directly below the kinematically vinterconnected by bevel gears 45 spindle 4 and in the same vertical plane therewith with a shaft 46 leading to a ha dwh el in 5 the shaft I carrying a pulley 8 in line with the front of th Cas vpulleyii, a driven shaft 9 in the rear of the By turning the handwheel 41 in one direction countershaft and in the same horizontal plane the rod 42 and the arms 40 and 4| are moved therewith, a driving shaft I!) in axial alignment to the right (Figs. 1, 3 and 4) and by turn- W h the driven shaft 9, a .clutch H for kineing the handwheel in the opposite direction these matically interconnecting the shafts 9 and I0 parts are moved to the left. When the rods and and a motor |2 for driving the shaft I0. The arms are moved to the right the cone 34 is clutch is of well-known construction and theremoved away from its complementary cone 30 and fore need not be described in detail, the clutch the cone is moved toward its complementary being actuated through.- the medium of clutch cone 3|; and when the rod 42 is moved to the 5 arms l3 (Fig. 2), a shaft l4 and a handle I5 10- left the cone 34 is moved toward its comple cated in' front of the head-stock casing. Inmentary cone 30 and the cone 35 is moved away stead of being journaled directly in the casing o i s comp Com AS Shown in Z the shaft 9 is supported by a ball-bearing l6 Fig. 3 the movable cones are in their left-hand mounted in a collar I! which in turn is mounted positions so that the belt 50, which is trained in an opening in the casing 2. over the two pulleys, engages the cones 30 and The countershaft 1 is supported by suitable 34 near their outer peripheries and the cones 3| bearings l8 "mounted inhubs l9 integral with and 35 near their inner peripheries, thereby drivand intermediate the ends of a pair of arms-20. ing the countershaft 1 much slower than the The rear ends of the arms 2|) surround a sleeve driven shaft 9. When the cones 34 and 35 are 22 and are pinned thereto (Fig. 4), the sleeve moved to 'the right to their other extreme posi- 22 being mounted on a shaft 23 which is eccention the belt 50 engages the cones 30 and 34 near trically mounted in the casing as shown at 24. their inner peripheries and the cones 3| andv The forward ends of the arms '20 are supported 35 near their outer peripheries, thereby driving by bolts 25 extending through horizontal slots the countershaft I much faster than the driven 26 in the arms (Fig. 3)' and thence through vershaft 3. By adjusting the position of the arms tical slots 21 in sleeves 23 mounted in openings in 40 and 4| to intermediate positions any desired the casing 2. Thus after loosening the bolts 25 intermediate speed ratio may be obtained. the arms may be moved lengthwise to adjust the From the foregoing it will be evident that my shaft I horizontally by rotating the eccentric improved lathe is compact in construction and shaft 2| by means of the handwheel 23 outside convenient in use, the controls being located in front of the head-stock casing in convenient positions and the means'for adjusting the countershaft 1 either vertically or horizontally, thereby to adjust the tension either or belts 6 or belt 50, being located outside the casing at the left-hand end thereof. It will also be noted that all of the controls and adjustments may be operated driving the spindle, a countershaft, a pulley on the countershaft, a belt trained over said pulleys} a driven shaft, means supporting said countershaft for movement toward and away from both said spindle and driven shaft, a driving shaft, a clutch for interconnecting the driving and driven shafts, V-pulleys on said driven and countershafts respectively, said' V-pulleys having opposite stationary-cones fast to their respective shafts and opposite adjustable cones movable along their respective shafts, means for moving said adjustable cones in unison, means coacting with said means supporting said countershaft for moving said countershaft toward and away from said driven shaft and said spindle and -means for locking said countershaft in adjusted position.

2. A lathe comprising a spindle, a pulley for driving the spindle, a countershaft, a pulley on the countershaft, a belt trained over said pulleys, a driven shaft, means supporting said countershaft for movement toward and away from both said spindle and driven shaft,- a driving shaft, a

clutch for interconnecting the driving and driven;

shafts, V-pulleys on said driven and countershafts respectively, said V-pulleys having opposite stationary cones fast to their respective shafts and opposite adjustable cones movable along their respective shafts, means for moving said adjustable cones in unison, means associated with the countershaft supporting means for moving it toward and away from said spindle andv means associated with the countershaft supporting means for moving it toward and away from said driven shaft, one of said means being effective to lock said countershaft in adjusted position.

3. A lathe comprising a spindle, a pulley for driving the spindle, a countershaft, a pulley on the countershaft, a belt trained over said pulleys,

a driven shaft, pivotal arms supporting said countershaft for movement toward and away from both said spindle and driven shaft, a driving shaft, a clutch for interconnecting the driving and driven shafts, V-pulleys on said driven and countershafts respectively, said V- pulleys having opposite stationary cones fast to their respective shafts and opposite adjustable vcones movable along their respective shafts,

means for moving said adjustable cones in unison, means coacting with one of said pivotal arms for producing relative adjustment of said driven and countershafts toward andfrom each other, and means coacting with the other end of said pivotal arms for producing relative adjustment of said spindle and countershaft toward and from each other. o

4. A lathe comprising a spindle, a pulley for driving the spindle, a countershaft, a pulley on the countershaft, a belt trained over'said pulleys, a driven shaft, a driving shaft, a clutch for interconnecting the driving and driven shafts, V- pulleys on said driven and countershafts respectively, said V-pulleys having opposite stationary cones fast to their respective shafts and opposite adjustable cones movable along their respective shafts, a belt trained over said V-pulleys, m'eans vfor moving said adjustable cones in unison, ,a pair of pivoted arms supporting sand countershaft intermediate their ends, means for shifting said arms lengthwise to adjust the tension of one of said belts and means for swinging the arms about their pivots to adjust the tension of the other of said belts.

- FREDERICK 'T. POTTER. 

